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Genetics Review
Test Description: Review of genetics terms and practice
Instructions: Answer all questions to get your test result.
1) A _____________ trait is expressed (seen) only if both genes of a pair code for that trait.
A
heterozygous
B
phenotype
C
dominant
D
recessive
2) A ______________ gene is one gene of a pair for a specific trait.
A
allele
B
phenotype
C
recessive
D
heterozygous
3) ____________ means that both genes of a pair are alike, either both dominant or both recessive
A
recessive
B
homozygous
C
dominant
D
heterozygous
4) Which of the following best represents a genotype?
A
Rd
B
Tt
C
WWw
D
blue eyes
5) What does that notation TT mean to genetics?
A
at least one dominant gene
B
one dominant and one recessive gene
C
two dominant genes
D
two recessive genes
6) The fruit fly normally has 8 chromosomes in the body cells. Each fruit fly parent would provide ____ to the offspring?
A
12 chromosomes
B
4 chromosomes
C
6 chromosomes
D
8 chromosomes
7) Scientists call an organism that has two different alleles for a trait a
A
factor
B
trait
C
hybrid
D
purebred
8) In a Punnett square, a capital letter stands for a _____ allele
A
dominant
B
heterozygous
C
recessive
D
homozygous
9) _____________ is the physical expression of the genes or how it looks.
A
phenotype
B
gene
C
recessive
D
heterozygous
10) A ______________ is a small piece of DNA that tells a cell how to express a trait.
A
dominant
B
chromosomes
C
gene
D
recessive
*select an answer for all questions
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